Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 395
and others diminished by theaction of the planets ? 7. On the repulsion theory should a comets tail be equally longwhen it is approaching the sun and when it is receding ? 8. Draw the diagram mentioned in the first paragraph of Art. 203. 9. Count the number of meteors you can observe in an hour… … Fig. 136. — The tower telescope of the solar observatory of the Carnegie Institution of Washington, Pasadena, California. 348 CHAPTER XITHE SUN I. The Suns Heat 210. The Problem of the Suns Heat. — The light andheat radiated by the sun are essential for the existence of lifeon the earth, and…
Astronomy
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